But one does not exclude the other though. She could have lied about being a human for all I care but that does not mean that she lied about something else.
I did not follow the Biden story that much because of the right-wing push who wanted to take the moral high-ground (they don't get the moral high-round). But when I see an story that is technically not related and is used to discredit the overall character of that person then I would see that as a smeer job even the mistakes of that person are proven to be true.
Trying to undermine the credibility of a person just because they might have done something, does not in my opinion, invalided the claim. Biden could have just as well did whatever this women claims as well that this women lied about XYZ.